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O Level Chemistry Admission Tests: Certification Test 189

Chemical Symbols Notes App Download & e-Book - 189

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MCQ: 189

All of these ions have a valency of +2 except

  1. Pb
  2. Ca
  3. Zn
  4. NH4

Chemical Symbols Admission Tests: O Level Chemistry App & eBook Notes

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Chemical Symbols Notes App (iOS & Android)

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